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CVE-2015-7977

18
FAUCET Score

CVE-2015-7977 describes a denial-of-service vulnerability in ntpd versions prior to 4.2.8p6 and 4.3.90, affecting various products including NTP, Debian, and Oracle. This medium-severity vulnerability (CVSS 5.9) allows remote attackers to trigger a NULL pointer dereference via a crafted ntpdc reslist command, leading to service disruption. While the attack complexity is high, no user interaction is required. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
>= 4.3.0, < 4.3.90CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.35%
Probability of exploitation in next 30 days
EPSS Percentile
92.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0635 is in the 92nd percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-10.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-25.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2015-7977Moderate

ntp: restriction list NULL pointer dereference

Jan 20, 2016

References

lists.fedoraproject.org / pipermail/package-announce/2016-February/177507.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2016-January/176434.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-04/msg00059.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-04/msg00060.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-05/msg00020.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-05/msg00038.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-05/msg00048.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-07/msg00026.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-08/msg00042.html
Broken Link
lists.opensuse.org / opensuse-updates/2016-05/msg00114.html
Broken Link
rhn.redhat.com / errata/RHSA-2016-0780.html
Broken Link
rhn.redhat.com / errata/RHSA-2016-2583.html
Broken Link
bto.bluecoat.com / security-advisory/sa113
Third Party Advisory
cert-portal.siemens.com / productcert/pdf/ssa-497656.pdf
Third Party Advisory
security.freebsd.org / advisories/FreeBSD-SA-16:09.ntp.asc
Third Party Advisory
security.gentoo.org / glsa/201607-15
Third Party Advisory
security.netapp.com / advisory/ntap-20171031-0001
Third Party Advisory
support.ntp.org / bin/view/Main/NtpBug2939
Vendor Advisory
support.ntp.org / bin/view/Main/SecurityNotice
Vendor Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-103-11
Third Party AdvisoryUS Government Resource
kb.cert.org / vuls/id/718152
Third Party AdvisoryUS Government Resource
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd
Third Party Advisory
debian.org / security/2016/dsa-3629
Third Party Advisory
oracle.com / technetwork/topics/security/linuxbulletinapr2016-2952096.html
Third Party Advisory
securityfocus.com / bid/81815
Third Party AdvisoryVDB Entry
securitytracker.com / id/1034782
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-3096-1
Third Party Advisory